netdev - Re: [RFC PATCH] dst: check if dst is freed in dst

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Date:	Tue, 20 Jul 2010 23:41:16 -0700 (PDT)
From:	David Miller <davem@...emloft.net>
To:	eric.dumazet@...il.com
Cc:	nicolas.dichtel@...nd.com, netdev@...r.kernel.org
Subject: Re: [RFC PATCH] dst: check if dst is freed in dst_check()

From: Eric Dumazet <eric.dumazet@...il.com>
Date: Wed, 21 Jul 2010 04:28:08 +0200

> Le mardi 20 juillet 2010 à 11:49 +0200, Nicolas Dichtel a écrit :
>> diff --git a/include/net/dst.h b/include/net/dst.h
>> index 81d1413..7bf4f9a 100644
>> --- a/include/net/dst.h
>> +++ b/include/net/dst.h
>> @@ -319,6 +319,8 @@ static inline int dst_input(struct sk_buff *skb)
>>  
>>  static inline struct dst_entry *dst_check(struct dst_entry *dst, u32 cookie)
>>  {
>> +	if (dst->obsolete > 1)
>> +		return NULL;
>>  	if (dst->obsolete)
>>  		dst = dst->ops->check(dst, cookie);
>>  	return dst;
> 
> I believe this is not needed and redundant.
> 
> In what case do you think this matters ?
> 
> To my knowledge dst_check() is only used by net/xfrm/xfrm_policy.c
> 
> And xfrm_dst_check() does the necessary checks.

Right, last time I was snooping around in here I came to the
same conclusion.  In fact I think I'm the author of that
enormous comment in xfrm_dst_check(). :-)


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